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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf0a0ea6a1b13615e26e5eeffa8b9da91ca672435fac766c4c4676e372d6c48' 
  AND token = '6+YyrCFp4ara7RRnELR13Rf+H7v3v69fLRusWJbeEQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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