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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80cf96e1667cc1aa8cdaad4e385441621a381341b1807e099a9d2954275fbb9' 
  AND token = 'zJscAPr0RR+zHH3SGbtnReYln4aBoI9TIydifvOouO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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