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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e84b4f90a89427efe30424b5b766f22e72dd6139c6e30e118214c43a3ccd58' 
  AND token = 'MBU7T+JnMW8AT40iR5oh4f6u1VEIMmuQnaVAXFBZ+Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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