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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77d28db6ef12c398d35fd250ee9eed3564fcfc84e78e67d73b813509375e7b2' 
  AND token = 'O15l0HLK1DSjDVtBvtHdTncQ75ipG+JyHboUsPUZjSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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