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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866fcb5db5543ffad633da6ab92bf4a3f783dc5e1f37104cd8517aafefc42be1' 
  AND token = 'XqQaF1v3SHDSe4IwEOwnOTaxcYqERFkodXd4/y3ozEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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