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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0b145a9fdc6ed4268ee488240e84786395af0c33edb162eeb0b67a81b2acc8' 
  AND token = 'az91A0+0ozjTM14XMcRr4HnmslRsbE55VyVRUT2j6rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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