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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68115470dd87e6a5042cf97c0ad026d3ebb3137f00080a1da2a3f47a0a12c9e' 
  AND token = '28cTyucV95yvny7rJnIendcFm+/Tc+1mH9fVPFIOR3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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