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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe1824d7b5e3d9342e980243bd28feaf10128f0eb2e9d53fa35787bf3b497bd' 
  AND token = 'x17nK7e/iBd7C9vc0/h6fFNcosW2L57tCNwiSHggSKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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