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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdcae6ead8726077f7e3f89e50af53349d4c4d174191bac426b3dca0a3855bd' 
  AND token = 'FppSzT2IAUlk54Cg1+C/cCM+lwchy1o14InGocM1hSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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