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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5f5f5489c0e05a6914b4fac65893dc378a5748731a1f90ae49fcbdcde42efe' 
  AND token = 'YDjrweruA84jeyGCextOqEZsCsRXPc+fdRlXSMhF0r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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