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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8093d49404a8e309acaf301956dd001f47a643fb7231c671536eeb5212e54ef' 
  AND token = 'BFTiBtsIZXZHFls59J+0KK/BFSbqgC/30I3foC2CyXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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