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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6054b426cc9f6856555ed3755143ceae3f4c46defe006706f6a85f1de47eeb9a' 
  AND token = '0wN3y+r8CTwN0C3PLnGTwvwhFVnE8MjcQaUVGYjUcNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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