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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd77ff64d0d75d461d87b5eaf635e3e186aa02a90e9e55559fd86cbf5e045d7' 
  AND token = 'i7U+KEfio/Jbge/BFCD40N+Q/ojceKYn/53YS5d58TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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