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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec2b23cccb9de460cfa15469f71cca3e126b69399183814f0b6955525c4b574' 
  AND token = '6q+8Pb02r8KD1R9u8qaoG4jrzgxaMwqcvBJKp4qc5Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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