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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cdd6949c2e412c8b00f3cdfabddead88fe571553d83fa869943d82d7c195b2' 
  AND token = 'z0/j1P7Xxr5hW4AEFsdEbcfCPUW7zcT+INebl4NuuJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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