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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9a4943fa2464b01743013946d5815a1e6c15547223e0d43c1a98921ae9bc3c' 
  AND token = 'U2VjXX534XXf2FRj3a10rJwYL1XNpv1w/3QgjCPbK2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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