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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6df4abbfe50859c0e03fba2582347d68aa6fb352feea86b15bbe4d451e63c8' 
  AND token = 'FTUxdhbVnwy8I94orpmw3NFoLiEY4BiR+Pso91Hmsqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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