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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e9e0f6bf4e6808285be764592a66a7d6c66f88ecb4c43e25234d764d0f8b0a' 
  AND token = 'dMndFFpGzhKuk1iAftPcr+cCrLyx1J+mD3fpXjYVebw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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