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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de62c470afbfbe0c4fb4075a406743ea963a1bf6fad82ae26bab2dd6451f465e' 
  AND token = 'YwPqYFLl5G2QfaYDry+6lmnSEhYv1uPqAh0myizeE1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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