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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977988edb3bf16b9eadeebfd1b4eb5a85d97f582345040a3bff3c6c4993bb47e' 
  AND token = 'DvxU7g4n9rhyei2SuEqeZ0stfkr2aF71iA40A+rUoy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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