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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d432798cfaf645a381c49fbd9970b8706e2a1675938455c5c0c39c00217537' 
  AND token = 'pVJLlNscsinu3ziVWsVPdR1zks4I9bK+4JfN8lm1R4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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