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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c475cf6539e1a54cdefb511108bd20d8a6ebc1272c40068b28577f4ea144b4' 
  AND token = 'nsK9SIVs0qeKSE09o56t9j9v+j0oM9AngXfBiuWHWLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}