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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15067e8d943839839f523e4bc8f19bda9ef084fcb118041bf92704d380ede3d7' 
  AND token = '4WJR3lzzVQsJRWWoqM6KhYpkQWJxukrfpfRwtI2dmTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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