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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce72e707fe534bf568d6e508153118d4902f75098b5f6787031e324e5742606' 
  AND token = 'pL3O7PuQgVBB6rvD2ms7zSfmVPKFeaOSk07dBe/tag0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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