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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b46441581b7128a1a657475d60b9bf61dd494f02526e2a27eea59ce546be03' 
  AND token = 'P5DC3eZbL2WWgcDHz6rSubHzxxHIuSZRXSK+yopYH70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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