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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b6b955aff2b3162671604370c17be68a15be89f62effde317a3e2708eb704e' 
  AND token = 'HPNu91z7IeEH8u/hbv23uBRUVQwpEVfvuPWP1JnA8Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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