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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1d2a09952b27b7af7053a83cd811d0c5176fc9174fe6b0a6253c0b3bcddf73' 
  AND token = 'R5QACyq/bJ9S1mL9/cMWcE36+wz0brJUQau4deORHp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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