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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfab56ef136fbc88196e0077b6dc602a9bad758e4faa969db8a244d134a0b33e' 
  AND token = 'K04oijlFPw8AUHbGlnBUTkeXA09jAgMw/OK3ishjHU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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