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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f95090b9f2e0451ab9166a92be7d72b999a0d048fd0b97871798bae06babba' 
  AND token = 'ldI48paPrrYe1D3rt4ZsZNS1fJAXc4/j9MkUmoIfliM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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