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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1a850dbb2825e33c01abcca6de073ee90d6c0e37796169c3fba122886b09f2' 
  AND token = 'W6y2VVhXElge447SbN43pI4pgiS0UUC5z3y1JvowRgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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