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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b96c297d23250ac40c37e42053f61a52f0972ca7069354985169ad735536150' 
  AND token = 'ziv88lVQi38rPR+LlXafs41Bj0gwO7VWB90LNpV0xCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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