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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0976cd2306f7fe266385efe5c4a095ad748d0fdbe66342363e4123e282396bd5' 
  AND token = 'tPBK1WleUhzkmO2D3vfE7YPQgLn1km7J+57Jyw9fu3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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